China's aluminum overcapacity may become the hidden stabiliser of its renewable power grid

For more than a decade, the phrase industrial overcapacity has been shorthand for possible inefficiency in China's heavy industries too many smelters, too much idle infrastructure, too much capital trapped in sectors that Beijing has repeatedly tried to rationalise. Aluminum has often sat at the centre of that debate because of its enormous electricity appetite and its strategic importance to manufacturing, transport, defence and energy transition technologies.

But a new research is challenging that entire narrative. Instead of treating overcapacity as a burden, the study argues that China's surplus aluminum-smelting capacity could become a critical flexibility tool for a renewable-heavy electricity system. Excess smelting capacity may function as a seasonal balancing mechanism for the grid, allowing industrial